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Non-oleic triglyceride based, low viscosity, high flash point dielectric fluids

a dielectric fluid and non-oleic triglyceride technology, applied in the field of dielectric fluids, can solve the problems of poor heat transfer operation using vo-based dielectric fluids, lowering of flash points or substituting with non-natural based sources, and lowering flash points

Active Publication Date: 2017-03-28
DOW GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent is about a composition of triglycerides that can be used as a dielectric fluid in electrical devices. The triglyceride is made up of specific fatty acids that are attached to glycerol molecules. The composition contains a specific amount of two different fatty acids, along with polyunsaturated and saturated fatty acids. This composition has specific viscosity, flash point, and melting point requirements. The use of this composition as a dielectric fluid can improve the performance and reliability of the electrical device.

Problems solved by technology

However, the VO-based dielectric fluids have significantly higher viscosity than the MO-based dielectric fluids, which results in a poorer heat transfer operation using a VO-based dielectric fluid.
However these approaches can lead to lowering of the flash point or to substituting with a non-natural based source;
However, this also results in lowering of the flash point;
3. Increasing the amount of unsaturation in the VO-based dielectric fluid lowers the viscosity of the fluid, but it also lowers the oxidation stability of the fluid (see U.S. Pat. No. 6,117,827); and

Method used

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  • Non-oleic triglyceride based, low viscosity, high flash point dielectric fluids
  • Non-oleic triglyceride based, low viscosity, high flash point dielectric fluids
  • Non-oleic triglyceride based, low viscosity, high flash point dielectric fluids

Examples

Experimental program
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specific embodiments

[0063]The dynamic viscosity of pure triglyceride may also be obtained using a mathematical model based on the following factors:[0064]1. Dynamic viscosity of methyl ester of fatty acid (FAME) which constitutes the triglyceride molecule.[0065]2. Number of carbon atoms in the fatty acid chain of FAME.

[0066]ln⁡(ηTAG)=0.5287-0.1542*ηFAME⁢1-0.1516*ηFAME⁢2-0.1542*ηFAME⁢3-1.5419*1nCF1-1.5158*1nCF2-1.5419*1nCF3+7.7064*ηFAME⁢1nCF1+7.7188*ηFAME⁢2nCF2+7.7064*ηFAME⁢3nCF3

Where

ηTAG=viscosity of triglyceride in cP

ηFAME1=viscosity of FAME present in the triglyceride at terminal position 1 in cP

ηFAME2=viscosity of FAME present in the triglyceride at central position 2 in cP

ηFAME3=viscosity of FAME present in the triglyceride at terminal position 3 in cP

nCF1=number of carbon atoms in the fatty acid chain of FAME at terminal position 1

nCF2=number of carbon atoms in the fatty acid chain of FAME at central position 2

nCF3=number of carbon atoms in the fatty acid chain of FAME at terminal position 3

The vi...

examples 1-10

[0076]The compositions reported in Table 1 are based on models built to predict the following properties of triglycerides and mixtures of triglycerides: viscosity, flash point and melting point. All examples exhibit the desired balance of viscosity ≦33 cP at 40° C. and ≦120 cP at 10° C., flash point ≧260° C., and melting point of −15° C. or less. The predicted melting point range provides the upper and the lower limit of the melting point of the mixture. This is based on the highest and lowest predicted melting points of the individual components of the composition. The melting points of the mixtures are determined by the methods mentioned above. Mixtures of triglycerides are highly interacting; hence the weight average is an approximate value of the melting point of the composition. The data on Example 5 show that the predicted melting points are identical to that determined experimentally by DSC. Similarly, there is very good agreement between the predicted and measured viscositie...

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Abstract

A vegetable-based dielectric fluid comprising in weight percent of triglycerides based on the weight of the fluid: A. Greater than 0 to 100% of at least one of C14:1 or C16:1 fatty acids; and at least one of: B. No more than (≦) 10% of C18:1 fatty acids; C. No more than (≦) 12% of one or more polyunsaturated fatty acids; and D. No more than (≦) 7% of one or more saturated fatty acids. The dielectric fluid is a useful transformer oil.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]This invention relates to dielectric fluids. In one aspect the invention relates to dielectric fluids comprising triglycerides of C14:1 and / or C16:1 fatty acids while in another aspect, the invention relates to dielectric fluids comprising triglycerides of C14:1 and / or C16:1 fatty acids in combination with one or more of polyunsaturated or saturated triglycerides and / or triglycerides of a C18:1 fatty acids.[0003]2. Description of the Related Art[0004]Vegetable oil (VO) based dielectric fluids, e.g., transformer fluids, have been increasingly used in the power generation industry to replace mineral oil (MO) based dielectric fluids because of their environmental friendliness and high flash point to improve safety of transformer operation. However, the VO-based dielectric fluids have significantly higher viscosity than the MO-based dielectric fluids, which results in a poorer heat transfer operation using a VO-based dielec...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H01B3/20C07C69/533A23D9/00
CPCH01B3/20A23D9/00C07C69/533A23V2250/00A23V2250/188A23V2250/1878A23V2250/1882A23V2002/00
Inventor NAIR, SREEJITGUPTE, KAUSTUBH S.LIN, THOMAS S.COGEN, JEFFREY M.CHAUDHARY, BHARAT I.FLORY, ANNY L.
Owner DOW GLOBAL TECH LLC